快速充电是近期新能源汽车起火的最主要原因。6月23日,中国科学院院士欧阳明高在2019中国(青海)锂产业与动力电池国际高峰论坛上称,新能源汽车行业过分追求快充,但充电算法过于简单,难以保证安全。
A Chinese scientist has blamed electric carmakers’ flawed fast-charging technology for recent fires involving cars made by Tesla and Nio.
The new-energy vehicle industry has placed too much emphasis on fast charging, and their charging algorithms are too simple to guarantee safety, says Ouyang Minggao, an academician at the Chinese Academy of Sciences and a new-energy vehicle expert.
Ouyang says his research team studied electric vehicles made by major automakers at home and abroad, including Tesla, and found that most electric vehicle batteries will deteriorate after 300 to 500 fast-charging cycles.
Fast charging a battery too many times can reduce the thermal runaway temperature and make it easier to trigger a fire.
Electric vehicles often offer both slow-charging and fast-charging features.
The slow option uses AC power, takes eight to 15 hours for a full charge and is generally used at home and in residential parking spaces.
Fast charging uses direct current, which can greatly shorten the charging time and is available only at charging stations.
Earlier this month, Tesla opened its first Supercharging station to the public, offering to recharge a Model 3 in as little as 15 minutes.
Ouyang says the rapid increase in charging capacity does not mean the technology is mature.
He says the algorithms controlling domestic chargers are too simple.